#include <bits/stdc++.h>
using namespace std;
#define int long long
void solve(){
int n, k;
cin >> n >> k;
vector<int> a(n);
for(int i = 0; i < n; i++) cin >> a[i];
vector<int> diff;
for(int i = 1; i < n; i++){
diff.push_back(a[i] - a[i-1] + 1);
}
sort(diff.begin(), diff.end());
int sol = 0;
for(int i = 0; i < k-1; i++){
sol += diff[i];
}
cout << sol+1 << endl;
}
int32_t main(){
ios_base::sync_with_stdio(false); cin.tie(nullptr);
int t = 1;
// cin >> t;
while(t--) solve();
return 0;
}
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